Simple Temperature Probe and Thermal Cutoff for Charger!

Very simple hobby project using a temperature probe and relay cut off. The cutoff temperature can be set in the relay using the preset push buttons. I have set it in such a way that the charging circuit will be cutoff when the charger temperature reaches 40°C. This relay can also be set the other way round to start a cooling fan in a radio amplifier when the power transistor reaches a particular temperature.